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Design of a conformal end-fire antenna

Author

Teo, Benjamin Zhe Ming

Date of Issue

2017-05-19

School

School of Electrical and Electronic Engineering

Abstract

This report present a design of a conformal antenna with end-fire radiation. The design is
based on low profile log-periodic monopole array antenna which are vertically polarized.
It consists of 21 elements and a microstrip feeding line which provides a 180⁰ phase shift
between each element. The monopoles antennas have a variation in height for the high
frequency region while the middle frequency region has monopole antennas of the same
height but loaded with top hat of different sizes to achieve the required resonant
frequencies. At the low frequency region, the design is like the middle frequency region
but each top-hat is folded. A wideband transmission is provided from a coaxial line to the
microstrip line designed for the antenna feed providing an inter-element of 180⁰ phase
shift. A prototype has been designed and tested through simulation. Simulation results
show that an impedance bandwidth from 2 to 18 GHz (9:1) for VSWR < 2.1 and a gain
better than 8dBi over the same operating frequency.